/Engine/Source/Runtime/SlateCore/Public/Layout/Children.h
typedef [TPaddingSingleWidgetSlotMixin](API\Runtime\SlateCore\Layout\TPaddingSingleWidgetSlotMixin)< [TSingleWidgetChildrenWithBasicLayoutSlot](API\Runtime\SlateCore\Layout\TSingleWidgetChildrenWithBasicLa-)< InPaddingInvalidationReason >, InPaddingInvalidationReason > PaddingMixinType